It depends what you mean by "for business platforms". Do you mean to run Ubuntu inside your business or do you mean to sell Ubuntu on systems? Or perhaps you mean you want to build applications on top of Ubuntu?
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popeyApr 24 '12 at 12:34

1

of course, for using it, and also to build applications on top of Ubuntu
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Mounaim CHApr 24 '12 at 12:38

What software do you normally use? Some have versions that run on linux, or alternatives, but Windows software often will not run on an Ubuntu machine (certainly not without time and effort). If you were to give us an idea of what your business does we will be able to help you better.
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Tamsyn MichaelJan 13 at 14:36

Our global community is made up of thousands of people who want to help build the best open-source operating system in the world. They share their time and skills to make sure that Ubuntu keeps getting better and better. From IBM to Google, Firefox to Wikipedia – some of today's best software is based on an open-source model. Shared efforts. Shared principles. No cost.

There also is a link Find out more about open source leading to a page entitled About Ubuntu - Our pilosophy where you find details on open source and why Ubuntu is free to use:

Quoting the Free Software Foundation's, 'What is Free Software,' the freedoms at the core of free software are defined as: The freedom to run the program, for any purpose.

No, you do not. Ubuntu is free as in "costing no money" to use for the default software (there is 3rd party software that can cost money). The only thing Ubuntu costs is the time you invest in getting to learn how it works.

Depending on how large your organization is it might be worth it to get some paid support with Ubuntu Advantage.

Ubuntu Advantage is the commercial support package from Canonical. It includes Landscape, the Ubuntu systems management tool, for running desktop, server and public cloud deployments, or building and managing private OpenStack clouds.